20821015374 has 16 divisors (see below), whose sum is σ = 43452554112. Its totient is φ = 6638584568.

The previous prime is 20821015343. The next prime is 20821015393. The reversal of 20821015374 is 47351012802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75438324 + ... + 75438599.

It is an arithmetic number, because the mean of its divisors is an integer number (2715784632).

Almost surely, 2^20821015374 is an apocalyptic number.

20821015374 is an abundant number, since it is smaller than the sum of its proper divisors (22631538738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20821015374 is a wasteful number, since it uses less digits than its factorization.

20821015374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150876951.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 20821015374 in words is "twenty billion, eight hundred twenty-one million, fifteen thousand, three hundred seventy-four".